Enhancing specific capacitance and cycling stability of zinc oxide-based supercapacitors using gamma-irradiated, amine-passivated carbon dots

The Fabrication of Amine‐Incorporated Zinc Complex/Carbon Dot Composite Electrodes Using Gamma Irradiation for High‐Performance Supercapacitors

“…The presence of sulfur is due to the facts that (i) carbon dots contain sulfur and (ii) sulfuric acid was used for neutralization after gamma irradiation, leading to the presence of sulfate. [38,52] The zinc complex/carbon dots composites were further characterized using FT-IR and XPS. As shown in FT-IR spectra (Figure 2a), all composites exhibited OÀ H/CÀ H, C=C/C=O, CÀ O/ CÀ N, and CÀ S functional groups, which correspond to the bands at 3300-2900, 1600-1500, 1200-1050, and 602 cm À 1 , respectively.…”

“…fabricated the Ni(OH 2 )/carbon dots composite electrode, which gave a capacitance of 2.3 times higher than the bare Ni(OH 2 ) electrode [37] . Recently, we reported the use of carbon dots to enhance the specific capacitance of the ZnO electrode by 312 % [38] . It was found that the carbon dots helped improve surface‐controlled processes and charge transport, increased electrochemical active surface area, wettability, and mechanical adhesion, and reduced the resistance of the electrode.…”

“…Although gamma irradiation has been used to prepare or modify a number of materials for various applications, its use in the supercapacitor field is rare, generally centralized to the modification of carbon‐based materials, [42–44] and a few inorganic materials [45–46] . We recently reported the use of gamma irradiation to incorporate the carbon dots with ethylenediamine (EDA) and the resulting carbon dots composited with ZnO yielded a significant improvement in the specific capacitance and cycling stability of the supercapacitors [38] . From these promising results, the exploitation/investigation of gamma irradiation on the novel materials will benefit the development of high‐performance electrode materials for supercapacitors.…”

“…[37] Recently, we reported the use of carbon dots to enhance the specific capacitance of the ZnO electrode by 312 %. [38] It was found that the carbon dots helped improve surface-controlled processes and charge transport, increased electrochemical active surface area, wettability, and mechanical adhesion, and reduced the resistance of the electrode. Based on these studies, carbon dots are intriguing nanomaterials for the performance enhancement of various supercapacitor electrode materials.…”

“…[45][46] We recently reported the use of gamma irradiation to incorporate the carbon dots with ethylenediamine (EDA) and the resulting carbon dots composited with ZnO yielded a significant improvement in the specific capacitance and cycling stability of the supercapacitors. [38] From these promising results, the exploitation/investigation of gamma irradiation on the novel materials will benefit the development of high-performance electrode materials for supercapacitors.…”